超导电性

The discovery of superconductivity with a critical temperature higher than 40 K in the iron arsenide LnFeAs has drawn much interest in condensed matter physics.

最近，由于在铁基LnFeAs化合物及其相关化合物中发现具有高于40K的超导电性，层状的铁基化合物引起了凝聚态物理学界很大的兴趣和关注。在随后的研究中发现，在该类材料中最高超导临界温度可达到55K。

We proposed that CDW order and superconducting order are competing with each orther ,which does not support the coexistence of these two orders.

我们根据这些新的观测结果对Sr14-xCaxCu24O41体系的相图进行了修正，并提出在该体系中CDW和超导电性是相互竞争的，没有共存的迹象。

We have further studied the effects of the spin density and charge densityfluctuations on the high-Tc superconductivity.

我们还进一步研究了电荷密度和自旋密度涨落对高温超导电性的影响。

High temperature superconductivity ; cryostat ; low temperature thermometer ; the tetrode method

高温超导电性；低温恒温器；低温温度计；四引线测量法

These two basic electrodynamic properties give superconductivity its unique interest.

上述两个基本电动力学性质使超导电性具有无比的重要性。

It is found that partial substitution of Sr for La induces the hole carrier evidenced by positive thermoelectric power but no bulk superconductivity is observed.

通过热电势的测量，我们发现在LaFeAsO中用少量的Sr部分取代La所获得的样品热电势为正值，说明体系中被引入了空穴载流子，但是并没有观察到超导电性。

The branch of physics that studies the properties of materials in the solid state: electrical conduction in crystals of semiconductors and metals; superconductivity; photoconductivity.

物理学中研究物质在固态中的性质：半导晶体的电流传导，超导电性和光导电性。

The discovery of high-temperature superconductivity by Bednorz and M〓ller in1986 opened a new chapter in the field of solid-state physics in general and in su-perconductivity in particular.

1986年，Bednorz和M〓ller的高温超导电性的发现，在广泛的固体物理领域，尤其在超导电性方面的研究打开了一个新的篇章。

In chapter 1, the progress in study of the ruthenium complex oxides. especially the coexistance of magnetism and superconductivity in 〓 and 〓 are introduced. The introduction makes conclusion that all of the Ru-1212 and Ru-1222 compounds reported are accompanied by small amounts of SrRuO〓 impurities, this is to say that, it is difficult to synthesize pure samples of these two compounds by traditional solid state reaction. So the author think that the studies for new synthesis methods of ruthenate superconductors which is beneficial to the synthesis of new type precious metals superconductivity is very important till now.

第一章重点综述了钌系复合氧化物的研究进展，特别是其中超导电性的发现及其钌系1212、1222相铜氧化物超导电性和铁磁性共存的特征，在此基础上可以看出，至今文献报道所获得的Ru-1212和Ru-1222相化合物都含有少量的SrRuO〓杂相，即很难通过原有的固相反应方法得到纯相化合物，由此作者提出，现有钌系超导氧化物合成的新方法研究仍具有重要的现实意义，这也将更有利于探索合成新型贵金属超导体。

Structural measurements and annealing results show that this phase is not caused by chemical imperfection but by oxygen dopants.

另外，对这种样品进行脱氧处理后，此超导电性相应消失，说明了这种高Tc的超导电性是由活动性空穴掺杂引起的。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。